Hash function

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HASH FUNCTION

description

Hàm băm (tiếng Anh: hash function) là giải thuật nhằm sinh ra các giá trị băm tương ứng với mỗi khối dữ liệu (có thể là một chuỗi kí tự, một đối tượng trong lập trình hướng đối tượng, v.v...). Giá trị băm đóng vai gần như một khóa để phân biệt các khối dữ liệu, tuy nhiên, người ta chấp hiện tượng trùng khóa hay còn gọi là đụng độ và cố gắng cải thiện giải thuật để giảm thiểu sự đụng độ đó. Hàm băm thường được dùng trong bảng băm nhằm giảm chi phí tính toán khi tìm một khối dữ liệu trong một tập hợp (nhờ việc so sánh các giá trị băm nhanh hơn việc so sánh những khối dữ liệu có kích thước lớn).

Transcript of Hash function

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HASH FUNCTI

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Intro to Modern Cryptography - Hash Function

Intro to Modern Cryptography - Hash Function

© Information Security Group, ICU1 Hash Function.

© Information Security Group, ICU1 Hash Function.

Hash Function Tutorial - University of Wollongong (UOW ...jennie/CSCI971/hash1.pdf · Hash Function A hash function (in the unrestricted sense) is a function which has, as a minmum,

Hash Function Tutorial - University of Wollongong (UOW ...jennie/CSCI971/hash1.pdf · Hash Function A hash function (in the unrestricted sense) is a function which has, as a minmum,

1 Hash table. 2 Objective To learn: Hash function Linear probing Quadratic probing Chained hash table.

1 Hash table. 2 Objective To learn: Hash function Linear probing Quadratic probing Chained hash table.

Evolving Universal Hash Function using Genetic Algorithms

Evolving Universal Hash Function using Genetic Algorithms

The DCH Hash Function - MITweb.mit.edu/dwilson/www/hash/dch/Supporting... · 2008-10-24 · The DCH Hash Function David A. Wilson dwilson@alum.mit.edu October 23, 2008 This document

The DCH Hash Function - MITweb.mit.edu/dwilson/www/hash/dch/Supporting... · 2008-10-24 · The DCH Hash Function David A. Wilson [email protected] October 23, 2008 This document

Hash Function, Digital Signature & Public Key Infrastructure

Hash Function, Digital Signature & Public Key Infrastructure

Hash Functions 1 Hash Functions Hash Functions 2 Cryptographic Hash Function Crypto hash function h(x) must provide o Compression output length is.

Hash Functions 1 Hash Functions Hash Functions 2 Cryptographic Hash Function Crypto hash function h(x) must provide o Compression output length is.

Hash Based Signatures - ETSI Hash Based Signatures? Confidence in its security As strong as the hash function Postquantum (assuming the hash function is postquantum)

Hash Based Signatures - ETSI Hash Based Signatures? Confidence in its security As strong as the hash function Postquantum (assuming the hash function is postquantum)

Hash Function Firewalls in Signature Schemes

Hash Function Firewalls in Signature Schemes

Hashing & Hash TablesHashing & Hash Tablesananth/CptS223/Lectures/hashing.pdf · Hash table: Main components key value Hash index e “john” key h(“john”) TableSiz Hash function

Hashing & Hash TablesHashing & Hash Tablesananth/CptS223/Lectures/hashing.pdf · Hash table: Main components key value Hash index e “john” key h(“john”) TableSiz Hash function

Computer Security and Industrial Cryptography - Automated Techniques for Hash Function ...cosic.esat.kuleuven.be/publications/thesis-203.pdf · Automated Techniques for Hash Function

Computer Security and Industrial Cryptography - Automated Techniques for Hash Function ...cosic.esat.kuleuven.be/publications/thesis-203.pdf · Automated Techniques for Hash Function

INTRODUCTION TO THE HASH FUNCTION AS A PERSONAL DATA ... · 3 of 31 CONTENTS I. INTRODUCTION AND PURPOSE 5 II. DIGEST OR HASH FUNCTION 5 Desirable properties in a hash function 7

INTRODUCTION TO THE HASH FUNCTION AS A PERSONAL DATA ... · 3 of 31 CONTENTS I. INTRODUCTION AND PURPOSE 5 II. DIGEST OR HASH FUNCTION 5 Desirable properties in a hash function 7

Chapter 5 Hash Functions - University of California, Davis · Chapter 5 Hash Functions A hash function usually means a function that compresses, meaning the output is shorter than

Chapter 5 Hash Functions - University of California, Davis · Chapter 5 Hash Functions A hash function usually means a function that compresses, meaning the output is shorter than

Current Trends in Artificial Intelligence · data (x) of arbitrary size to data of fixed size (y): hash(x) = y Cryptographic hash function: “non-reversible” hash function (and

Current Trends in Artificial Intelligence · data (x) of arbitrary size to data of fixed size (y): hash(x) = y Cryptographic hash function: “non-reversible” hash function (and

12 Hash Functions - Oregon State Universityweb.engr.oregonstate.edu/~rosulekm/crypto/chap12.pdf12 Hash Functions A hash function is any function that takes arbitrary-length input and

12 Hash Functions - Oregon State Universityweb.engr.oregonstate.edu/~rosulekm/crypto/chap12.pdf12 Hash Functions A hash function is any function that takes arbitrary-length input and

Key Management, Message Authentication, Hash Function &

Key Management, Message Authentication, Hash Function &

hash tables - cs.sfu.ca · A Good Hash Function Independent hash function: Express the key as an integer (if it isn’t already one), called hash value or hash code . When doing so

hash tables - cs.sfu.ca · A Good Hash Function Independent hash function: Express the key as an integer (if it isn’t already one), called hash value or hash code . When doing so

Hash tables - cs.bgu.ac.ilds202/wiki.files/hash.pdf · Open addressing Hash tables. Hash table with chaining Let h : U !f0;:::;m 1gbe a hash function (m

Hash tables - cs.bgu.ac.ilds202/wiki.files/hash.pdf · Open addressing Hash tables. Hash table with chaining Let h : U !f0;:::;m 1gbe a hash function (m

A New Approach to Hash Function Construction for Textual ...afrodita.zcu.cz/~skala/PUBL/PUBL_2014/2014_WICT-Hash-Final.pdf · given data set [12]. The perfect hash function gives

A New Approach to Hash Function Construction for Textual ...afrodita.zcu.cz/~skala/PUBL/PUBL_2014/2014_WICT-Hash-Final.pdf · given data set [12]. The perfect hash function gives